Structure of ceiling fan blades their frames

ABSTRACT

A structure of blade and blade frame for a ceiling fan is disclosed. The inserting parts of a blade frame go through the through holes on a blade. Each inserting part has a stopping part exposed from the blade. An elastic positioning element connects several limiting parts using linear linking parts. The limiting parts urge against the stopping parts in opposite directions, providing constraints between the stopping parts and the blade and, thereby, combining the blade and the blade frame.

BACKGROUND OF THE INVENTION

1. Field of Invention

The invention relates to a ceiling fan structure and, in particular, tothe combination structure of ceiling fan blade and its frame.

2. Related Art

There are usually several blade frames around the motor at the center ofa ceiling fan. Each blade frame is mounted with a blade. The inventionpertains the technique of combining the blades with their correspondingframes.

In the early days, the blades are fixed on the frames in a ceiling fan.Such a combination is done by simple screw locking. For example, theblade frame is provided with a screw to go through the correspondingblade. A bolt is then used to lock the blade and the blade frame. Such astructure has some inconvenience in the disassembly because each parthas to taken apart. Therefore, designs with more convenience structuresstart to appear.

FIGS. 7 to 9 show three conventional structures of the blades and theirframes.

As shown in FIG. 7, the blade 50 has a through hole 501. The blade frame51 has a hook 511 protruding from it and forming a groove 52 in between.The blade 50 is mounted on the blade frame 51, followed by moving theirrelative position so that the blade 50 is embedded in the groove 52.Afterwards, a positioning element 53 is inserted for positioning.

Please refer to FIG. 8. The blade 60 has a through hole 601. The bladeframe 61 has a clip 611. Inserting the clip 611 through the through hole601 and adjusting the relative position between the blade and the bladeframe, the clip fixes and positions the blade 60 on the blade frame 61.

Finally, the please refer to FIG. 9. The blade 70 has several throughholes 701 in the shape of the number 8, formed by two holes of differentdiameters. An inserting part 711 on the blade frame 71 goes through thelarger hole. Afterwards, the stopping part 712 on the inserting part 711falls into the smaller hole by moving the relative position between theblade 70 and the blade frame 71, thereby fixing them.

Although the above-mentioned three structures of blade and blade frameare more convenient than the conventional structure using screws, thehook, clip or inserting part is positioned on the blade after goingthrough the corresponding through hole. They have to satisfy a certainprecision in order to achieve a firm connection, so that no seriouswiggles happen when the ceiling fan operates. Taking the structure inFIG. 8 as an example, the blade may fall off as the blade moves towardthe motor because the clip can depart from the blade.

Therefore, it is the goal of the invention to provide a structure ofblade and blade frame that can be readily combined and firmly fixedwithout the need for a high precision as in the prior art.

SUMMARY OF THE INVENTION

It is an objective of the invention to provide a structure of blade andblade frame for a ceiling fan that is simple and convenient to assemble.

The invention includes:

a blade, whose one end has at least two through holes;

a blade frame, which has an inserting part for each of the through holeson the blade, each of the inserting parts having a stopping part thatprevents the blade frame from leaving the blade on the exposed end fromthe blade; and

an elastic positioning element restoring its position after pressurerelease, which has a plurality of limiting parts each of which urgesagainst the stopping parts after the inserting parts go through thecorresponding through holes, blocking the stopping parts by stickingbetween the stopping parts and the blade.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will become more fully understood from the detaileddescription given herein below illustration only, and thus is notlimitative of the present invention, and wherein:

FIG. 1 is a three-dimensional exploded view of the invention;

FIG. 2 is three-dimensional perspective view of the invention;

FIG. 3 is a schematic assembly view of the invention;

FIG. 4 is a top view of the limiting part and the inserting part inposition according to the invention;

FIG. 5 is a side view of the limiting part and the inserting part inposition according to the invention;

FIG. 6 is a schematic assembly view of the second embodiment of theinvention;

FIG. 7 shows the structure of the blade and blade frame used in a firstconventional ceiling fan;

FIG. 8 shows the structure of the blade and blade frame used in a secondconventional ceiling fan; and

FIG. 9 shows the structure of the blade and blade frame used in a thirdconventional ceiling fan.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will be apparent from the following detaileddescription, which proceeds with reference to the accompanying drawings,wherein the same references relate to the same elements.

According to an embodiment, the disclosed structure of ceiling fan bladeand blade frame includes: a blade 1, a blade frame 2, and a positioningelement 3.

The blade 1 has at least two through holes 11 on one end. As shown inthe drawing, the blade 1 in this embodiment has three through holes 11arranged in a triangular shape.

The blade frame 2 has an inserting part 21 for each of the through hole11 on the blade 1. Each of the inserting parts 21 has a stopping part211. The stopping part 211 goes through the corresponding through hole11 and exposes on the blade 1.

In this embodiment, the inserting parts 21 are independent elements.They are fixed on the blade frame 2 by screws.

The positioning element 3 is elastic and has several limiting parts 31.The limiting parts 31 are connected by a linking part 32 with a linearstructure. After the inserting part 21 goes through the correspondingthrough hole 11, the positioning element 3 is disposed so that thelimiting parts 31 urge against the stopping parts 211 and block them bysticking between the stopping parts 211 and the blade 1.

In this embodiment, the positioning element has limiting parts 311 onboth ends to coil between the blade and the stopping parts. The twolimiting parts 311 are connected by a linking part 32 with anotherlimiting part 312 also coiling between the blade and the stopping part.The positioning element 3 is thus mounted between the stopping parts 211and the blade 1 with the help of the inserting parts 21 on the bladeframe 2.

Each of the stopping parts 211 includes a first stopping part 211 a forthe limiting part 31 to block after it restores its position and asecond stopping part 211 b blocking the limiting part 31 after theinserting part 21 goes through the through hole 11.

Besides, the blade 1 has a covering element 4 in this embodiment forcovering the part of the inserting part 21 exposed from the blade 1 andthe positioning element 3.

Please refer to FIGS. 3 to 5. The inserting parts 21 of the blade frame2 go through the through holes 11 of the blade 1, so that the stoppingparts 211 at the end of the inserting parts 21 expose from the blade 1.Moreover, the positioning element 3 is pressed inward in such a way thatit is slightly deformed and disposed among the inserting parts 21. Eachof the limiting parts 31 is disposed at the corresponding inserting part21. They restore their positions after the positioning element 3 isreleased. The limiting parts 31 then urge against the inserting parts 21between the stopping parts 211 and the blade 1.

Each of the limiting parts 31 of the positioning element 3 urges againstthe corresponding first stopping part 211 a in parallel to the blade 1(FIG. 4). Moreover, each of the limiting parts 31 surrounds between theblade 1 and the second stopping part 211 b to stop the second stoppingpart 211 b in the normal direction of the blade 1 (FIG. 5).

Therefore, the positioning element 3 is positioned between the insertingpart 21 and the blade 1. If one carelessly touches or pushes thelimiting parts 31 or linking part 32 of the positioning element 3, theelasticity thereof prevents the limiting parts 31 from falling off.Moreover, the two inserting parts 311 and the inserting part 312 in thedrawing provide opposite blocking forces. Thus, they provide constraintson the inserting parts 21. Taking the structure in this embodiment as anexample, when the blade 1 is withdrawn outwards with respect to theblade frame 2, the two limiting parts 311 block it. When the blade 1 ispushed inward with respect to the blade frame 2, the limiting part 312blocks it. In other words, it does not have same problem as in the priorart where the blade may fall off because the blade and the blade framehave a blocking force in the same direction.

It is clear from the above description that a primary advantage of theinvention is to in the simple assembly structure between the blade andthe blade frame. Such a structure can prevent the blade from falling offthe blade frame.

There are of course many other embodiments of the invention onlydiffering in details. Please refer to FIG. 6 for a second embodiment ofthe invention. The blade 1 has four through holes 11. The blade frame 2has four corresponding inserting parts 21. The positioning element 3 hasa rectangular shape with two limiting part 313 protruded from and twolimiting parts 314 recessed on opposite ends. The limiting elements 313,314 all have an arc shape. The limiting parts 313, 314 are alsoconnected using a linear structure 32.

In this embodiment, the positioning element is mounted by squeezing therecessed limiting parts 314. It is then released after the two limitingparts 313 are mounted on the corresponding inserting parts 21. In thiscase, the limiting parts 313, 314 of the positioning element block thecorresponding inserting parts 21. Using such a structure, the blade 1and the blade frame 2 can be positioned as in the first embodiment.

Although the invention has been described with reference to specificembodiments, this description is not meant to be construed in a limitingsense. Various modifications of the disclosed embodiments, as well asalternative embodiments, will be apparent to people skilled in the art.Therefore, it is contemplated that the appended claims will cover allmodifications that fall within the true scope of the invention.

1. A structure of blade and blade frame for a ceiling fan, comprising: ablade, whose one end has at least two through holes; a blade frame,which has an inserting part for each of the through holes on the blade,each of the inserting parts having a stopping part that prevents theblade frame from leaving the blade on the exposed end from the blade;and an elastic positioning element restoring its position after pressurerelease, which has a plurality of limiting parts each of which urgesagainst the stopping parts after the inserting parts go through thecorresponding through holes, blocking the stopping parts by stickingbetween the stopping parts and the blade.
 2. The structure of blade andblade frame for a ceiling fan as in claim 1, wherein the inserting partsare independent elements fixed on the blade frame.
 3. The structure ofblade and blade frame for a ceiling fan as in claim 1, wherein the bladehas a covering element to cover the part of the inserting part exposedfrom the blade and the positioning element.
 4. The structure of bladeand blade frame for a ceiling fan as in claim 1, wherein the positioningelement has a hook-shaped limiting part on either end thereof andanother arc-shaped limiting element between the two hook-shaped limitingparts connected using a linear structure.
 5. The structure of blade andblade frame for a ceiling fan as in claim 1, wherein the positioningelement has a linear linking part between each two consecutive limitingparts.
 6. The structure of blade and blade frame for a ceiling fan as inclaim 1, wherein each of the stopping parts includes a first stoppingpart for the limiting part to block after it restores its position and asecond stopping part blocking the limiting part after the inserting partgoes through the through hole.